How to soundproof hotel rooms?

Sound insulation of hotel rooms: 1. Sound insulation treatment of doors and windows Because doors and windows are open parts and thinner than walls, doors and windows are the weak links of sound insulation. If the decibel exceeds 50 decibels, it will affect sleep and rest; More than 70 decibels interfere with the conversation, causing upset and inattention; Working or living in a noise environment above 90 decibels for a long time.